|
Hi Alec, I very much like the idea of using a barometer to see if there is any pressure build up in the cabin and as part of the O2 dosing system. A pesky leak is what got Kittredge. When he was at depth it wouldn't of bled out of a small or large over pressure valve/pop off valve, until the pressure was over the pressure at the outlet of the over pressure valve and able to over come what ever the spring pressure is on the valve(s). So when he decided to pop to the surface quickly, a small over pressure valve likely wouldn't able to let enough air out fast enough. Regards, Szybowski Subject: RE: [PSUBS-MAILIST] Side Thruster Options Date: Mon, 15 Jun 2009 16:14:52 -0400 From: Alec.Smyth@compuware.com To: personal_submersibles@psubs.org Simple solution... just put a T in your pressure gauge line, and a little check valve of the kind that's a SS ball seated by a spring. You can get them for maybe 10 bucks on eBay and they work like a charm. I know, a small instrumentation line isn't large enough to relieve huge volumes of air. But what you're contending with is pesky little small leaks that go unnoticed. Also, install a barometer in the sub. From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent Hartwig Sent: Saturday, June 13, 2009 4:14 PM To: PSUBSorg Subject: RE: [PSUBS-MAILIST] Side Thruster Options Hello Alec, Your reminded me of one reason I didn't wish to go with air compensated thrusters. It was a slow bleed into the interior of a K-250 that George was running, that made the hatch dome pop out when he started to ascend, and he was lucky to of survived. This is also why I plan to install a over pressure valve much like the larger one that is installed on the KSS. Except I'll be mounting mine in the bottom of the sub so it can also be used to drain the sub after a wet exit training exercise. Regards, Szybowski |